From owner-cvs-src-old@FreeBSD.ORG  Wed Jan  6 16:52:11 2010
Return-Path: <owner-cvs-src-old@FreeBSD.ORG>
Delivered-To: cvs-src-old@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 9CDF61065770
	for <cvs-src-old@freebsd.org>; Wed,  6 Jan 2010 16:52:11 +0000 (UTC)
	(envelope-from bz@FreeBSD.org)
Received: from repoman.freebsd.org (repoman.freebsd.org
	[IPv6:2001:4f8:fff6::29])
	by mx1.freebsd.org (Postfix) with ESMTP id 8AF8F8FC19
	for <cvs-src-old@freebsd.org>; Wed,  6 Jan 2010 16:52:11 +0000 (UTC)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.14.3/8.14.3) with ESMTP id o06GqBhU003522
	for <cvs-src-old@freebsd.org>; Wed, 6 Jan 2010 16:52:11 GMT
	(envelope-from bz@repoman.freebsd.org)
Received: (from svn2cvs@localhost)
	by repoman.freebsd.org (8.14.3/8.14.3/Submit) id o06GqBes003521
	for cvs-src-old@freebsd.org; Wed, 6 Jan 2010 16:52:11 GMT
	(envelope-from bz@repoman.freebsd.org)
Message-Id: <201001061652.o06GqBes003521@repoman.freebsd.org>
X-Authentication-Warning: repoman.freebsd.org: svn2cvs set sender to
	bz@repoman.freebsd.org using -f
From: "Bjoern A. Zeeb" <bz@FreeBSD.org>
Date: Wed, 6 Jan 2010 16:51:57 +0000 (UTC)
To: cvs-src-old@freebsd.org
X-FreeBSD-CVS-Branch: RELENG_7
Subject: cvs commit: src/sys/netinet tcp_input.c tcp_subr.c tcp_var.h
X-BeenThere: cvs-src-old@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: **OBSOLETE** CVS commit messages for the src tree
	<cvs-src-old.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src-old>,
	<mailto:cvs-src-old-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src-old>
List-Post: <mailto:cvs-src-old@freebsd.org>
List-Help: <mailto:cvs-src-old-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src-old>,
	<mailto:cvs-src-old-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 06 Jan 2010 16:52:11 -0000

bz          2010-01-06 16:51:57 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_7)
    sys/netinet          tcp_input.c tcp_subr.c tcp_var.h 
  Log:
  SVN rev 201655 on 2010-01-06 16:51:57Z by bz
  
  MFC r184722:
  
    Fix a bug introduced with r182851 (r201653 in stable/7) splitting
    tcp_mss() into tcp_mss() and tcp_mss_update() so that tcp_mtudisc()
    could re-use the same code.
  
    Move the TSO logic back to tcp_mss() and out of tcp_mss_update().
    We tried to avoid that initially but if were are called from
    tcp_output() with EMSGSIZE, we cleared the TSO flag on the tcpcb
    there, called into tcp_mtudisc() and tcp_mss_update() which
    then would reenable TSO on the tcpcb based on TSO capabilities
    of the interface as learnt in tcp_maxmtu/6().
    So if TSO was enabled on the (possibly new) outgoing interface
    it was turned back on, which lead to an endless loop between
    tcp_output() and tcp_mtudisc() until we overflew the stack.
  
    Reported by:  kmacy
  
  Revision    Changes    Path
  1.370.2.17  +10 -9     src/sys/netinet/tcp_input.c
  1.300.2.17  +1 -1      src/sys/netinet/tcp_subr.c
  1.157.2.8   +1 -1      src/sys/netinet/tcp_var.h